Lithium iron phosphate material, preparation method thereof and lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problem of performance stability of mixed materials, no obvious advantages in cost and cycle performance, fast attenuation, and poor cycle performance etc. to solve the incompatibility between high volume density and low-temperature rate performance, improve low-temperature performance, and ensure high-pressure compaction
CN114843487AActive Publication Date: 2022-08-02HUBEI JINQUAN NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI JINQUAN NEW MATERIALS CO LTD
Publication Date
2022-08-02

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Abstract

The invention relates to a lithium iron phosphate material, a preparation method thereof and a lithium ion battery, the preparation method comprises the following steps: (1) mixing iron phosphide and first mixed powder, and sanding to obtain a doped precursor; (2) mixing a carbon source and the second mixed powder, carrying out secondary granulation, and roasting to obtain a coated precursor; and (3) mixing the doped precursor obtained in the step (1) and the coated precursor obtained in the step (2), and calcining to obtain the lithium iron phosphate material, wherein the step (1) and the step (2) are not divided into a sequence; the first mixed powder and the second mixed powder respectively and independently comprise phosphorus iron lithium mixed powder. According to the preparation method provided by the invention, organic combination of carbon coating and doping is adopted, the lithium iron phosphate material with excellent low-temperature performance and high compaction is obtained, and the problem that high volume density and low-temperature rate performance of lithium iron phosphate are incompatible is solved.
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Description

technical field

[0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and relates to a preparation method of a lithium iron phosphate material, in particular to a lithium iron phosphate material, a preparation method thereof, and a lithium ion battery. Background technique

[0002] At present, new energy vehicles are hot, lithium-ion batteries are more and more used in power vehicles, and the performance requirements of batteries are also increasing. The promotion and wide-scale application of power batteries requires lithium-ion batteries with better safety and better performance. Compared with the short-life shortcomings of lead-acid batteries, the safety defects and high cost of ternary lithium-ion batteries are difficult to solve, and lithium iron phosphate batteries with relatively compromised or even advantageous performance in all aspects are even more advantageous.

[0003] Lithium iron phosphate batteries als...

Claims

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